http://tsplin.es/tsTrial - Download a free trial of T-Splines for Rhino.

This from a webinar recorded on June 20, 2010, using T-Splines v2.3. Kyle Houchens demonstrates how to make glasses from just a lens.

Difficulty:
Beginner

Commands used:
Delete • tsConvert • tsCrease • tsExtrude • tsFillHole • tsInsertEdge • tsMakeUniform • tsManip • tsSmoothToggle • tsSymmetry • tsThicken • tsWeight • tsWeld